Which of the following sets of animals belong to class Cyclostomata?

Herdmania and Petromyzon

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Petromyzon and Myxine

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Amphioxus and Balanoglossus

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Herdmania and Myxine

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Solution

The correct option is B Petromyzon and Myxine
Herdmania comes under phyla Tunicata or Urochordata. Amphioxus is Cephalochordate while Balanoglossus is hemichordate. Both Petromyzon (Lamprey) and Myxine (Hagfish) belong to class Cyclostomata of Division Agnatha vertebrates.

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